Prepare stuffing mixes according to package directions. Meanwhile, in a large bowl, combine soup and milk; set aside.
Divide chicken between two greased 13-in. x 9-in. baking dishes. Sprinkle with pepper. Layer with ham, Swiss cheese, 1 cup cheddar cheese, soup mixture and stuffing. Sprinkle with remaining cheddar cheese.
Cover and freeze one casserole for up to 3 months. Cover and bake the remaining casserole at 350° for 30 minutes. Uncover; bake 10-15 minutes longer or until cheese is melted.
Defrost frozen casserole overnight in fridge before using. Each casserole is 6 servings.